This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Before the decoupling, A) deuterium produced electrons and positrons. B) protons and electrons ... (Read 119 times)

RRMR

  • Hero Member
  • *****
  • Posts: 557
on: Jul 27, 2018
Before the decoupling,
 
  A) deuterium produced electrons and positrons.
  B) protons and electrons combined to form atoms.
  C) the universe was opaque to radiation.
  D) there was more helium than hydrogen.
  E) the universe was transparent to radiation.

Question 2

Why don't stars less massive then type M exist?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

popopong

  • Sr. Member
  • ****
  • Posts: 307
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

A body less massive than a type M star (about 8 the Sun's mass) will not get hot enough by gravitational collapse to start fusing hydrogen into helium.


RRMR

  • Member
  • Posts: 557
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

CAPTAINAMERICA

  • Member
  • Posts: 325
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Mendel's breeding program that produced a 9 : 3 : 3 : 1 ratio Mendel's breeding program that produced a 9 : 3 : 3 : 1 ratio
Spiral Produced by twisting stresses that are spread along the length of a bone (note the break in t Spiral Produced by twisting stresses that are spread along the length of a bone (note the break in t
Texaco, which produced this poster, used a racist caricature to discourage absenteeism among ... Texaco, which produced this poster, used a racist caricature to discourage absenteeism among ...
Photochemical smog is produced by a complex series of reactions Photochemical smog is produced by a complex series of reactions
What nuclide is produced when Pb-210 decays by beta emission? What nuclide is produced when Pb-210 decays by beta emission?
Laboratory-Produced Protocells Laboratory-Produced Protocells
Video: DNA Replication Factory and Protein

For a complete list of videos, visit our video library